A charge is kept at the central point 
of a cylindrical region. The two edges subtend a half-angle 
at 
, as shown in the figure. When 
, then the electric flux through the curved surface of the cylinder is 
if 
, then the electric flux through the curved surface becomes 
, where the value of 
is .
Text Solution
Verified by Experts3
(3)
For any 
, let us first find the flux inside a cone of half angle 
. we know that for such a cone, solid angle subtended at centre is
Flux through 1 cone 
Flux through curved surface
And 
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